Given the reaction:Na2S2O3(aq) + 4Cl2(g) + 5H2O(aq) --> 2NaHSO4(aq) + 8HCl(aq), how many moles of Na2S2O3 are needed to react with 0.12mol of Cl2?

1 Answer
Nov 22, 2015

0.03 mol Na2S2O3

Explanation:

We can use the mole ratio to solve this problem. We will assume that we have excess H2O and it won't effect our ratio. We are told that we will react 0.12 mol of Cl2 so we will start there.

0.012molCl2 X 1molNa2S2O34molCl2= 0.03molNa2S2O3

When setting up the dimensional analysis it is important that you pay attention to how many moles are in the balanced equation, that is the mole ratio.